**Question :** The kinetic energy 𝑘 of a particle moving along a circle of radius 𝑅 depends on the distance covered 𝑠 as 𝑘 = 𝑎𝑠 2 where 𝑎 is a constant

(A) 2a\dfrac{s^{2}}{R}

(B) 2as\left( 1+\dfrac{s^{2}}{R^{2}}\right) ^{\dfrac{1}{2}}

(C) 2as

(D) 2a\dfrac{R^{2}}{s}

**Answer :** option (B)

**Solution :**

*Related*